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Lexicon, Inc.
RV-8 Serial Communications Protocol
The 3 protocol layers are: Physical, Data Link, and Application Layers.
Physical Layer (RS232)
5 Physical Layer
5.1 DB-9 RS232 Connector
RV-8
COM1
Transmit Data
2
Receive Data
3
5
Ground
9 Pin D-Shell (female)
Note: The wiring requirements for a 9 pin to 9 pin serial connection, are a male to female straight through
cable.
5.2 Serial Port Driver
RV-8 serial port has been setup to operate as follows:
Operating Mode:
Baud rate:
Data Size:
Parity:
Stop Bits:
Hardware Handshaking:
5.3 Errors
The RV-8 will detect parity, framing and data overrun errors. If any of the physical layer errors are
detected, the complete packet is corrupted and the RV-8 will reset the transaction and begin to look for a
start of packet byte.
5.4 RV-8 Receive Buffer
The RV-8 has an internal receive buffer. The buffer is 256 Bytes and will transmit a NAK packet with an
error code of DC_ERR_BUFFER_FULL to the HOST if the buffer is full. If the buffer is full, all data
© 2005 Lexicon, Inc. All rights reserved.
Data Link Layer
Application Layer
9 Pin D-Shell (female)
2
3
5
9 Pin D-Shell (male)
Host
2
2
3
3
5
5
Full Duplex
19.2K baud
8 bits (1 byte)
Odd
1
None
Printed on: 07/26/05
Receive Data
Transmit Data
Ground
9 Pin D-Shell (male)
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